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X - 1/X = 7 ആയാൽ X² + 1/X² എത്ര?

A51

B47

C49

D15

Answer:

A. 51

Read Explanation:

X - 1/X = 7 ( X - 1/X)² = X² - 2 × X × 1/X + 1/X² X² + 1/X² = ( X - 1/X)² + 2 = 7² + 2 = 49 + 2 = 51


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